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12x-200=2x+400
We move all terms to the left:
12x-200-(2x+400)=0
We get rid of parentheses
12x-2x-400-200=0
We add all the numbers together, and all the variables
10x-600=0
We move all terms containing x to the left, all other terms to the right
10x=600
x=600/10
x=60
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